StartUp start = new StartUp(this);
        my = new Thread(start.Go);
        my.Start();

my.Abort();

public void Go ()
{
    int max = work.max_thread;
label1:
    if (work.keys.Count>0)
    {
        while (count_thread == 0 || count_thread < max)
        {
            Thread myThread = new Thread(web.InD);

            myThread.Start();
            count_thread += 1;
        }
        Thread.Sleep(1000);
        goto label1;
    }
}